The Department of Special Investigation (DSI) has seized 360,000 items falsely labelled with luxury brand names, in Nakhon Nayok province and in Bang Bon district of Bangkok.
Raids targeted 12 outlets at markets in Nakhon Nayok and a Bang Bon warehouse, the DSI said on Tuesday.
The counterfeit goods confiscated by police in the raids had a collective street value around 20 million baht.
A tip-off led the DSI to the Rong Kluea Market and the markets in Nakhon Nayok, where 300,000 fake items bearing expensive brand names such as Louis Vuitton, Chanel and Coach were confiscated.
In Bangkok, the DSI discovered more than 60,000 fake brand-name jeans in a warehouse in the Bang Bon area.
The counterfeit goods were smuggled from a neighbouring country, evading the 25% import tax, police said.